An Opinion from Open-Minded American
It seems to me, that the majority of "my fellow Americans" on this board are giving the movie low marks on account of its failure to completely explain everything: 'Too many plotholes, things aren't explained away', etc etc. And I see other people, who, I presume from their colloquialism-usage, are English, who give the movie good marks.
I personally thing it did a wonderful job. Things aren't simply explained away (Ok, Dr. Character walks in, "Ok guys, the kids have a virus. It effects this part of the brain and makes the lil' heathens go psycho!") and the way genuine human beings would react are shown.
The "knob" never really sees the children do anything bad perse, and he acts accordingly. The blond-mom isn't sure what to think after killing her son, I think the thing on the whole does a great job of showing a great big human mess.
In the end, we don't know EXACTLY what causes the chaos, because there is no blatant Dr. Character. But we're as clueless as the characters are, which I think lends to our being slightly on edge.
I also tend to think this is a general difference between the two countries on their types of horror. Another example would be The Descent, in which -exactly- what happened in the ending is never really shown or explained.. Where the monsters come from aren't explained away, etc. I think I am starting to like British horror more..
Opinions on this dividing line?